水平轴风力机风轮尾迹与圆柱型塔架的相互干涉

FLOW INTERACTION BETWEEN HAWT ROTOR WAKE AND DOWNSTREAM CIRCULAR TOWER

建立了一个考虑上游风轮尾迹与下游塔架相互干涉的物理模型,并进行了详细的数值模拟。基于Navier-Stokes方程,重点研究了上游尾迹与下游圆柱型塔架相互干涉的二维物理特征、旋涡脱落频率、力的脉动与频谱以及纵向位置的影响;计算的流场与水洞进行的激光诱导荧光显示技术的流场显示结果进行了对比;在相同的横向位置和来流条件下,获得了处于不同纵向位置的干涉结果。研究结果对于揭示风力机风轮尾迹与下游塔架相互干涉的物理机理,减少由于位势干涉和尾迹粘性所诱导的非定常气动力,以及对于风力机的气动弹性稳定性和噪声辐射的研究等都有着重要的理论价值。

The physical model concerning the flow interaction between rotor wake and downstream tower was developed and the numerical investigation was conducted in detail. It is shown to be quite difficult to characterize the full 3D unsteady flow features in terms of the experiment and numerical study due to the nature of complex flow unsteadiness and three-dimensional flow around the horizontal axis wind turbine system. Based on Navier-Stokes equations, the flow physics in two-dimension were studied mainly restricting on the vortex shedding frequency, the force perturbation and its spectrum, and the effect of lateral position as well. The comparison was made between the computed flow field and the flow pattern performed by LIF in a water tunnel. The results is significant in the understanding of the physical mechanism of flow interaction between rotor wake and downstream tower, the reduction of the interaction forces contributed by the potential interaction and the wake viscosity, as well as the studies of elasticity and noise radiation of horizontal axis wind turbine.